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Alert Notice 144: Supernova 1991X in NGC 4902 AND Monitoring of 1910-33 RY Sagittarii

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso
Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 144 (May 6, 1991)

SUPERNOVA 1991X IN NGC 4902

Robert McNaught, Anglo-Australian Telescope, informs us of the visual discovery of a
supernova in NGC 4902 by AAVSO member Robert O. Evans, Hazelbrook, Australia.
The discovery was made on May 5.49 UT at visual magnitude 13.5-14. The supernova
is offset from the nucleus of the galaxy 13.9" east, 10.7" north. The position
of the supernova (1950.0, from R. McNaught) is:

   RA 12h 58m 22.55s Decl. -14deg 14' 29.8"

According to McNaught, "The supernova ... is situated just on the edge of the
bar and inside the ring" of the galaxy. Please use the accompanying AAVSO
preliminary "d" scale chart of SV Vir and the Thompson/Bryan chart of NGC 4856
for sequences for observing the supernova, and report your observations to
AAVSO HQ so we may forward them to the Central Bureau for Astronomical Telegrams.

Our congratulations to Bob on his latest discovery!

MONITORING OF 1910-33 RY SAGITIARII

Observers are reminded of the upcoming observing run with the IUE on RY Sgr (see
AAVSO Alert Notice 138). This R Coronae Borealis star is gradually returning to
maximum light after its recent minimum. Please monitor RY Sgr throughout the
month of May, particularly on May 22 and 31, when the IUE observations will be
made, and please telephone your estimates in on May 20 and May 29, so we may
inform the astronomers.

The AAVSO HQ answering machine (617-354-0484) is on nights and weekends. Thank
you very much for your efforts and astronomical contributions.

Clear Skies! Good Observing!

Janet A. Mattei
Director

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